Question

The standard deviation of a population is known to be 7.8. If The sample size is 85, what is the standard error of the mean?

1) 0.22


2) 0.85


3) 1.047


4) 6.008

Answer 1

Answer: the answer is b. 85

Explanation

Answer 2

The given standard deviation of a population (σ) = 7.8

sample size (N) = 85

We have to find standard error of the mean.

The formula to find standard error of the mean

= (standard deviation of the distribution) / (square root of sample size)

= (σ) / (√N)

= 7.8 / (√85)

= 7.8 / 9.219544457

= 0.8460

= 0.85 (approximately taken to two decimal places)

We have got the required answer.

The standard error of the mean is 0.85.